Radial Nerve Sensory Branch Anatomical Variant: A Case Report and Literature Review.

Case: Two patients sustained comminuted extra-articular distal humerus fractures. One patient was neurovascularly intact preoperatively. The other patient had a complete radial motor palsy with preserved sensation. Intraoperatively, both exhibited anatomic variants of the radial sensory nerve of the arm that pierced the triceps rather than branching from the distal third of the radial nerve proper, as is traditionally reported.

Conclusions: Although rare, variations in the radial nerve may exist about the distal humerus. Surgeons should be aware of these variations to avoid iatrogenic injury.